Here's some real world numbers for you. Here are my last two runs...
Dallas, TX - Columbus, MS - Birmingham, AL - Huntsville, AL - Dallas, TX
Dallas, TX - Victoria, TX - Corpus Christi, TX - Houston, TX - Baton Rouge, LA - New Orleans, LA - Dallas, TX
These two runs were over 8 days and I grossed about $4600, that's GROSS. You'll need to cut that pretty much in half after expenses. Oh, that's with a 3 car hauler. My rig is a RAM 3500 with a 43' Kaufman tri-axle trailer with 3' flippers added in the after market. My monthly gross is $10k - $13k. I'm driving 25 days a month averaging around 9k/month.
Can you make that kind of money, yes, but I do have some reservations about your truck. I'm not too sure if you're 2500 SWR will be able to deal with the weights you'll have to tote around.
Hope this helps.